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Postretirement Medical Benefits (Tables)
 12 Months Ended
Dec. 31, 2014
Postretirement Medical Benefits [Abstract]  
Net Periodic Benefit Costs
Net periodic benefit cost related to our plans includes the following components (in thousands):

  
December 31,
 
U.S. postretirement plan:
 
2014
  
2013
  
2012
 
Service cost
 
$
1
  
$
1
  
$
4
 
Interest cost
  
26
   
33
   
81
 
Amortization of prior service cost
  
(2,888
)
  
(4,206
)
  
(4,752
)
Amortization of unrecognized loss
  
2,092
   
2,548
   
2,887
 
Net periodic benefit cost
 
$
(769
)
 
$
(1,624
)
 
$
(1,780
)
             
Canadian postretirement plan:
            
Service cost
 
$
—
  
$
—
  
$
—
 
Interest cost
  
4
   
5
   
5
 
Amortization of prior service cost
  
(129
)
  
(140
)
  
(142
)
Amortization of net actuarial loss
  
(45
)
  
(115
)
  
(52
)
Net periodic benefit cost
 
$
(170
)
 
$
(250
)
 
$
(189
)
Total net periodic benefit cost
 
$
(939
)
 
$
(1,874
)
 
$
(1,969
)
One-Percentage-Point Change in Assumed Health Care Cost Trend Rate
Assumed health care cost trend rates have a significant effect on the amounts reported for the health care plans.  A one-percentage-point change in assumed health care cost trend rates would have the following effects for 2015 (in thousands):

  
1-Percentage-
Point Increase
  
1-Percentage-
Point Decrease
 
Effect on total of service and interest cost components
 
$
1
  
$
(1
)
Effect on postretirement benefit obligation
  
33
   
(34
)
Postretirement Benefit Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Funded (Unfunded) Status
The benefit obligation, funded status, and amounts recognized in the consolidated financial statements for our postretirement medical benefit plans as of and for the years ended December 31, 2014 and 2013, were as follows (in thousands):
 
  
Postretirement Benefit Plans
 
  
U.S. Plan
  
Canadian Plan
 
  
2014
  
2013
  
2014
  
2013
 
Change in benefit obligation:
        
Benefit obligation at beginning of year
 
$
4,960
  
$
5,950
  
$
126
  
$
156
 
Service cost
  
1
   
1
   
—
   
—
 
Interest cost
  
26
   
33
   
4
   
5
 
Benefits paid
  
(772
)
  
(850
)
  
(26
)
  
(21
)
Actuarial loss (gain)
  
(23
)
  
(174
)
  
17
   
(4
)
Translation adjustment
  
—
   
—
   
(11
)
  
(10
)
Benefit obligation at end of year
 
$
4,192
  
$
4,960
  
$
110
  
$
126
 
(Unfunded) status of the plans
 
$
(4,192
)
 
$
(4,960
)
 
$
(110
)
 
$
(126
)
Amounts Recognized in Balance Sheet
  
Postretirement Benefit Plans
 
  
U.S. Plan
  
Canadian Plan
 
  
2014
  
2013
  
2014
  
2013
 
Amounts recognized in the balance sheet:
        
Accrued postretirement benefit liabilities
 
$
4,192
  
$
4,960
  
$
110
  
$
126
 
Accumulated other comprehensive (income) loss (pre-tax) related to:
                
Unrecognized net actuarial losses (gains)
  
2,973
   
5,087
   
(65
)
  
(129
)
Unrecognized prior service cost (credit)
  
—
   
(2,888
)
  
(201
)
  
(335
)
Actuarial Assumptions Used to Determine Costs and Benefit Obligations
Actuarial assumptions used to determine costs and benefit obligations related to our U.S. postretirement plan are as follows:

  
December 31,
 
  
2014
  
2013
  
2012
 
Discount rate
  
0.55
%
  
0.45
%
  
0.55
%
Expected Future Benefit Payments
The following benefit payments which reflect expected future service, as appropriate, are expected to be paid (in thousands):
 
2015
 
$
2,257
 
2016
  
1,300
 
2017
  
68
 
2018
  
64
 
2019
  
60
 
Years 2020 – 2024
  
226
 
Canadian Postretirement Benefit Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Actuarial Assumptions Used to Determine Costs and Benefit Obligations
Actuarial assumptions used to determine costs and benefit obligations related to our Canadian postretirement plan are as follows:

  
December 31,
 
  
2014
  
2013
  
2012
 
Discount rates
  
3.00
%
  
3.50
%
  
3.00
%
Current medical cost trend rate
  
6.43
%
  
7.14
%
  
8.57
%
Ultimate medical cost trend rate
  
5
%
  
5
%
  
5
%
Year trend rate declines to ultimate
  
2017
   
2017
   
2017